Circular saw



FIG. 1 is a front elevational view of the design;

FIG. 2 is a rear elevational view of the circular saw in FIG. 1;

FIG. 3 is a left side elevational view of the circular saw in FIG. 1;

FIG. 4 is a right side elevational view of the circular saw in FIG. 1;

FIG. 5 is a top plan view of the circular saw in FIG. 1;

FIG. 6 is a bottom plan view of the circular saw in FIG. 1; and,

FIG. 7 is a perspective view of the circular saw of FIG. 1.

The ornamental design for a circular saw, as shown and described.